Cement slurries for deep holes, with a copolymer content for...

Details Cement slurries for deep holes, with a copolymer content for... Cement slurries for deep holes, with a copolymer content for...

E - Fixed Constructions

21

B

31/22, 261/56.3

E21B 33/14 (2006.01) C04B 24/16 (2006.01) C09K 8/46 (2006.01)

Patent

CA 1228373

- 1 - Abstract of the disclosure: Cement slurries for deep holes, with a content of copolymers which are composed of 5 - 95 % by weight of groups of the formula Image (I) or Image (II) in which R1 is hydrogen or methyl, R2 is C2-C10-alkylene and Me is ammonium, lithium, sodium or potassium, of 5 - 60 % by weight of groups of the formula Image (III) in which R3 is hydrogen, -CH3 or C2H5 and R4 is -CH3 or C2H5, or R3 and R4 together are a propylene group which, with incorporation of the radical Image forms a pyrrolidone radical, and of 0 - 90 % by weight of groups of the formula Image (IV) - 2 - in which R6 is hydrogen or methyl and R7 is carboxamido, carboxyl, cyano or carbomethoxy. These copolymers reduce the water loss of cement slurries which are required for deep holes.

445860

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